x + 64 = 72
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a.(64 - 32 ) :8 = 32 : 8 = 4
b. 36 x 2 x7 + 36 x 86
= 36 x (14 + 86)
= 36 x 100
= 3600
68:8 - 32 : 8
= ( 68 - 32): 8
= 36 : 8
= 4,5
72 x 7 + 36 x 86
= 72 x 7 + 36 x 2 x 43
= 72 x 7 + 72 x 43
= 72 x ( 7 + 43)
= 72 x 50
= 3600
![](https://rs.olm.vn/images/avt/0.png?1311)
301 - x + 72 = 64 . (x - 21)
301 - x + 72 = 64x - 1344
301 + 72 + 1344 = 64x + x
1717 = 65x
=> x = 1717/65
Chúc em học tốt!!!
\(301-x+72=64\left(x-21\right)\)
\(\Leftrightarrow301+72-x=64x-1344\)
\(\Leftrightarrow373-x=64x-1344\)
\(\Leftrightarrow373+1344=64x+x\)
\(\Leftrightarrow1717=65x\)
\(\Leftrightarrow x=\frac{1717}{65}\)
\(\text{Vậy }x=\frac{1717}{65}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(28\cdot\left(231+64\right)+72\cdot\left(230+70\right)\)
\(=28\cdot295+72\cdot300\)\(\)
\(=8260+21600\)
\(=29860\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) `1/2 xx 5/4 + 1/2 xx 3/4 + 1/2`
`=1/2 xx (5/4 + 3/4 + 1)`
`=1/2 xx 3`
`=3/2`
b) `72/95 xx 64/72 xx 95/72 xx 14/86 xx 72/64 xx 86/14`
`=(72xx64xx95xx14xx72xx86)/(95xx72xx72xx86xx64xx14)`
`= 1`.
![](https://rs.olm.vn/images/avt/0.png?1311)
8 x 6 = 48
8 x7 = 56
8 x 8 = 64
8 x 9 = 72
48 : 8 = 6
56 : 8 = 7
64 : 8 = 8
72 : 8 = 9
x = 8
k mk nha mk nhanh nhất
x + 64 = 72
x = 72 - 64
x = 8![avt529503_60by60.jpg](/images/avt/avt3/avt529503_60by60.jpg)
k mình nhé